a supreme court decision upholding the constitutionality of obama care. and if that doesn't strike you as political, consider what would have happened on the campaign trail if the high court had struck down the president's signature first term achievement. >> at a certain point i've just concluded that for me personally, it is important for me to go ahead and affirm that i think same-sex couples should be able to get married. >> reporter: the first president to endorse same-sex marriage was a daily double moment. good politics aimed at an activist wing of his party base and most certainly history. and finally, the number one political moment of the year is easy during elections. >> cnn projects that barack obama will be re-elected president of the united states. >> we are greater than the sum of our individual ambitions, and we remain more than a collection of red states and blue states. we are and forever will be the united states of america. >> reporter: for auld lang syne, acute confetti and say good-bye to 2012 and all its moments historical and hyste